Make "alpha only" be a property of GrTextureProducer

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrCaps.h"
 #include "GrContext.h"
 #include "GrDrawContext.h"
-#include "GrTextureParamsAdjuster.h"
+#include "GrImageIDTextureAdjuster.h"
 #include "effects/GrYUVtoRGBEffect.h"
 #include "SkCanvas.h"
 #include "SkBitmapCache.h"
 #include "SkGpuDevice.h"
 #include "SkGrPixelRef.h"
 #include "SkGrPriv.h"
 #include "SkImageFilter.h"
 #include "SkImage_Gpu.h"
 #include "SkPixelRef.h"
 
@@ skipping 49 matching lines @@
     return true;
 }
 
 bool SkImage_Gpu::asBitmapForImageFilters(SkBitmap* bitmap) const {
     bitmap->setInfo(make_info(this->width(), this->height(), this->isOpaque()));
     bitmap->setPixelRef(new SkGrPixelRef(bitmap->info(), fTexture))->unref();
     bitmap->pixelRef()->setImmutableWithID(this->uniqueID());
     return true;
 }
 
-class GpuImage_GrTextureAdjuster : public GrTextureAdjuster {
-public:
-    GpuImage_GrTextureAdjuster(const SkImage_Gpu* image)
-        : INHERITED(image->peekTexture())
-        , fImage(image)
-    {}
-
-protected:
-    void makeCopyKey(const CopyParams& params, GrUniqueKey* copyKey) override {
-        GrUniqueKey baseKey;
-        GrMakeKeyFromImageID(&baseKey, fImage->uniqueID(),
-                             SkIRect::MakeWH(fImage->width(), fImage->height()));
-        MakeCopyKeyFromOrigKey(baseKey, params, copyKey);
-    }
-
-    void didCacheCopy(const GrUniqueKey& copyKey) override { as_IB(fImage)->notifyAddedToCache(); }
-
-private:
-    const SkImage*  fImage;
-
-    typedef GrTextureAdjuster INHERITED;
-};
-
 GrTexture* SkImage_Gpu::asTextureRef(GrContext* ctx, const GrTextureParams& params) const {
-    return GpuImage_GrTextureAdjuster(this).refTextureSafeForParams(params, nullptr);
+    return GrImageTextureAdjuster(as_IB(this)).refTextureSafeForParams(params, nullptr);
 }
 
 bool SkImage_Gpu::isOpaque() const {
     return GrPixelConfigIsOpaque(fTexture->config()) || fAlphaType == kOpaque_SkAlphaType;
 }
 
 static void apply_premul(const SkImageInfo& info, void* pixels, size_t rowBytes) {
     switch (info.colorType()) {
         case kRGBA_8888_SkColorType:
         case kBGRA_8888_SkColorType:
@@ skipping 275 matching lines @@
     if (!dst) {
         return nullptr;
     }
     
     const SkIRect srcR = SkIRect::MakeWH(desc.fWidth, desc.fHeight);
     const SkIPoint dstP = SkIPoint::Make(0, 0);
     ctx->copySurface(dst, src, srcR, dstP, GrContext::kFlushWrites_PixelOp);
     return dst;
 }